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Method and system for ripple-spring compression assessment

  • US 7,418,858 B2
  • Filed: 06/15/2005
  • Issued: 09/02/2008
  • Est. Priority Date: 06/15/2005
  • Status: Expired due to Fees
First Claim
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1. A method of determining the condition of an installed ripple spring in an electric-generator stator with the use of a compression-assessment tool having a non-contact proximity sensor, the method comprising the steps of:

  • calibrating the compression-assessment tool;

    placing the compression-assessment tool on the surface of a stator wedge of a test stator having an unknown ripple-spring compression;

    linearly displacing the compression-assessment tool over the length of the stator wedge of the test stator;

    measuring the compression of the ripple spring of the test stator through the stator wedge by directly measuring the proximity of an upper surface of the ripple spring to the compression-assessment tool;

    comparing the output signal obtained from the test stator to a reference output signal obtained from calibrating the compression-assessment tool in order to determine the relative compression and condition of the ripple spring of the test stator.

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